But if you believe surveys of the general public, only about a third of people with a garage actually use it to store a car. 22 feet is still smaller than the average attached garage depth in many parts of the country, where the average attached garage measures 20’x20′. Developers instead cannibalize garage space to create more livable square footage. Garage space is simply yet another thing at a premium in the modern economy. Does your daily actually fit in your garage, or are you suffering from the pressures of stuff creep just like the rest of us?